JPH091777A - Sheet feeder for sheet-feed press - Google Patents

Abstract

PURPOSE: To prevent flowing a surface of a sheet by a sheet feeder of a sheet- feed press. CONSTITUTION: A stop finger 6, which allows a sheet to pass to a sheet feed cylinder 2 by swinging downward and prevents it from passing by swinging upward, is provided. An upper feed roller 4 which separates the sheet from a feed roller 5 by swinging upward and sends the sheet together with the lower feed rollers, is provided. When a front edge of the sheet faces a gripping claw 14 of the sheet feed cylinder, the upper feed roller is swung downward by a first cam mechanism linked to the sheet feed cylinder. When the upper feed roller is swung downward, the stop finger 6 is swung downward by a second cam mechanism linked to the sheet feed cylinder. After the sheet has passed, the stop finger is swung to return upward by a third cam mechanism linked to the sheet feed cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device of a sheet-fed printing press.

[0002]

2. Description of the Related Art A conventional sheet feeding device of a sheet-fed printing press, as shown in FIGS. 7 to 9, sandwiches a sheet 3 from above and below between a sheet feeding conveyor 1 and a sheet feeding cylinder 2. Upper feed roller 4 and lower feed roller 5 for feeding to the paper feed cylinder 2
And the stop finger 6 that holds down the front edge of the sheet 3
And a lower paper guide 7 which is located between the upper feed roller 4 and the lower feed roller 5 and supports the sheet 3 from below.

The lower feed roller 5 is a sheet feeding conveyor 1.
A gear mounted on the side end of the sheet feeding cylinder 2 and pivotally supported by the printer frames 8a and 8b (see FIGS. 1 and 2) on the operating side and the non-operating side at a fixed position between the sheet feeding drum 2 and the sheet feeding drum 2. 9 (see FIG. 6) is used to rotate.

The upper feed roller 4 has two arms 1.
The two arms 1 are rotatably supported at the ends of 0a and 10b.
0a and 10b are fixed to the swing shaft 11, and the swing shaft 11 is pivotally supported by the printing machine frames 8a and 8b. A lever 12 is loosely fitted to the swing shaft 11, and the lever 12 abuts on a cam 13 at the side end of the paper feed cylinder 2 via a roller 12a. The cam 13 is provided with the lever 12 and the swing shaft 11 when the gripper claw 14 of the paper feed cylinder 2 comes to a position where the sheet 3 is gripped.
The upper feed roller 4 is swung downward via the arms 10a and 10b to be pressed against the lower feed roller 5.

The stop finger 6 is attached to another swing shaft 15 pivotally supported by the printing machine frames 8a and 8b, and a cam 16 is attached to the swing shaft 15 to swing the upper feed roller 4. A lever 17 loosely fitted on the moving shaft 11 contacts the cam 16.

Then, the sheets 3 are sent one by one to the sheet feeding cylinder 2 by the sheet feeding conveyor 1, hit the stop fingers 6 and stop, and the gripping claws 14 of the sheet feeding cylinder 2 arrive. Wait (Fig. 7). When the gripper 14 comes, the cam 13 of the paper feed cylinder 2 causes the upper feed roller 4 to swing downward,
Along with the swing, the lever 17 and the cam 16 on the swing shaft 11
Stop finger 6 swings downward due to the engagement with
The sheet 3 is quickly sent to the jaw 14 (FIG. 8). When the sheet 3 is clamped by the gripper claw 14, the upper feed roller 4 swings upward by the cam 13 of the paper feed cylinder 2 to release the sheet 3 (FIG. 9), and the stop finger 6 swings. The torsion coil spring 25 (see FIG. 2) interposed between the moving shaft 15 and the printer frame 8b swings back upward until it hits the leading edge of the succeeding sheet 3 and the gripper 14 arrives. The sheet 3 will be stopped (FIG. 7).

[0007]

In the conventional paper feeding apparatus, since the swing of the stop finger 6 and the upper feed roller 4 is interlocked with each other, as shown in FIG. When the upper feed roller 4 tries to swing upward after being held by 6, the stop finger 6 also tries to swing upward and return at the same time. However, at that time, the sheet 3 is still passing over the stop finger 6, and the tip 6a of the stop finger 6 comes into contact with the surface of the sheet 3 and scratches it, so that the sheet 3 is scratched. is there.

It is therefore an object of the invention to provide a means for preventing the stop fingers of a paper feeder from coming into contact with the surface of a sheet.

[0009]

In order to achieve the above object, the present invention allows the sheet 3 to pass through toward the paper feed cylinder 2 when it is swung downward and allows the sheet to be swung upward. A stop finger 6 for preventing passage of the paper 3 toward the paper feed cylinder 2,
Lower feed roller 5 capable of contacting the lower surface of the sheet 3
An upper feed roller 4 which, when swung upward, separates from the lower feed roller 5 and swung downward, sandwiches the sheet 3 together with the lower feed roller 5 and sends the sheet 3 toward the paper feed cylinder 2. When the front edge of the sheet 3 faces the gripper claw 14 of the sheet feeding cylinder 2, the upper feed roller 4 is swung downward and then is swung upward. A first cam mechanism, a second cam mechanism that interlocks with the sheet feeding cylinder 2 that swings the stop finger 6 downward when the upper feed roller 4 swings downward, and the sheet feeding cylinder 2 After the sheet 3 held by the gripper 14 passes over the stop finger 6, the stop finger 6 is swung above the lower feed roller 5 and is interlocked with the paper feed cylinder 2. 3 cam mechanism The configuration of the sheet feeding device of the sheet-fed printing press provided is adopted, and in the sheet feeding device of the sheet-fed printing press, when an illegal sheet feeding occurs, the first, second and third cam mechanisms are used. The structure is provided with an engagement / disengagement mechanism that keeps the stop finger 6 and the upper feed roller 4 in a state of being rotated upward by cutting off the transmission of.

[0010]

The sheet 3 is stopped by the front edge of the sheet 3 being caught by the stop finger 6 swinging upward, and waiting for the gripping claw 14 of the sheet feeding cylinder 2 to arrive.

When the gripping claw 14 arrives, the first cam mechanism causes the upper feed roller 4 to swing downward, and
The cam mechanism causes the stop finger 6 to swing downward. As a result, the stop finger 6 releases the sheet 3 and the upper feed roller 4 sandwiches the sheet 3 together with the lower feed roller 5 and immediately feeds it toward the jaw 26, which causes the sheet to be cut. Hold the front edge of the paper 3.

When the sheet 3 reaches the gripper claw 14, the first
The upper feed roller 4 swings upward by the cam mechanism of (1) and separates from the lower feed roller 5 to release the sheet 3.

On the other hand, the stop finger 6 is regulated by the third cam mechanism, and the sheet 3 held by the holding claw 14 of the paper feed cylinder 2 passes above the stop finger 6 and then rocks upward. And the tip is made to project above the lower feed roller 5. Then, the advancing path of the succeeding sheet 3 is blocked, and the sheet 3 is stopped until the gripping claw 14 arrives again.

When an illegal sheet feeding occurs in the sheet feeding device of the sheet-fed printing press, the engagement / disengagement mechanism is activated, and the first and second
The transmission from the third cam mechanism is cut off, and the stop finger 6 and the upper feed roller 4 are kept rotating upward. As a result, the supply of the sheet 3 to the sheet feeding cylinder 2 is stopped.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. This sheet-fed printing machine is, for example, an offset printing machine,
A paper feeding device is provided in front of the paper feed cylinder 2 that also functions as the impression cylinder.

As shown in FIGS. 3 and 6, the paper feed cylinder 2 has a shaft 2a and a left and right printing press frames 8a, 8a.
It is supported by 8b and rotated in the direction of the arrow by power from a drive source (not shown). The paper feed cylinder 2 is provided with a gripping claw 14 at a predetermined position thereof, and the sheet 3 sent from the paper feeding device is held by the gripping claw 14 while being rotated and is fed to the printing section. .

The left side printing press frame 8a corresponds to the operating side of the printing press, and the printing press frame 8b corresponds to the non-operating side of the printing press. As shown in FIGS. 1 to 4, the sheet feeding device for feeding the sheet 3 to the sheet feeding cylinder 2 includes a sheet feeding conveyor 1 for feeding the sheet 3 forward, and a sheet coming from the sheet feeding conveyor 1. An upper feed roller 4 and a lower feed roller 5 which feed the sheet 3 one by one from above and below and feed it toward the paper feed cylinder 2.
A stop finger 6 for temporarily blocking the front end of the sheet 3 and a lower paper guide 7 which is located between the upper feed roller 4 and the lower feed roller 5 and supports the sheet 3 from below. ing.

The lower paper guide 7 is used for the sheet 3
It is a plate material arranged on the traveling path of No. 1 and is fixed on a stay 18 which is stretched between the left and right printing machine frames 8a and 8b.

The lower feed roller 5 is the sheet 3
Left and right printing machine frames 8a so that they can contact the lower surface of the
8b is supported by a shaft 5a and a bearing 5b. A gear 19 is fixed to the shaft 5a of the lower feed roller 5, and a gear 9 fixed to one end of the paper feed cylinder 2 meshes with this via an intermediate gear 20. The lower feed roller 5 locally projects upward from the opening 7a of the lower paper guide 7 and comes into contact with the lower surface of the sheet 3.

The upper feed roller 4 separates from the lower feed roller 5 when swung upward, and sandwiches the sheet 3 together with the lower feed roller 5 when swung downward and holds the sheet 3 of the paper feed cylinder 2. It is designed to be sent to people.

More specifically, the left and right printing press frames 8
Two arms 10a and 10b are fixed to a swing shaft 11 that is horizontally supported by a and 8b, and the upper feed roller 4 is rotatably supported by the tips of the arms 10a and 10b via a pin 4a and a bearing 4b. ing. The swing shaft 1
1 is capable of reciprocating angular movement in conjunction with the paper feed cylinder 2 via a first cam mechanism, and the upper feed roller 4 is vertically swung along with the movement.

The first cam mechanism includes a lever 12 attached to the swing shaft 11 and a cam 13 attached to the side end of the paper feed cylinder 2. The lever 12 is the arm 1
0b is attached via a protrusion amount adjusting device, and a cam follower 12a at the tip thereof is pressed against a cam 13 fixed to the side end of the paper feed cylinder 2. The cam 13 has a contour such that the lever 12 swings only once for each rotation of the paper feed cylinder 2. As a result, the paper feed cylinder 2
The lever 12 swings once per one rotation, and the upper feed roller 4 swings up and down once to feed one sheet 3 toward the gripper claw 14.

The protrusion amount of the lever 12 can be adjusted with respect to the cam 13 by a protrusion amount adjusting device. That is, the lever 12 is loosely fitted to the swing shaft 11 via a clearance, and the rear end of the lever 12 bent into an L shape is attached to the base block of the arm 10b via the coil spring 21 and implanted in the base block. A threaded rod 22 penetrates the coil spring 21 and the rear end of the lever 12.
Then, the adjusting knob 23 is attached to the protruding portion of the screw rod 22.
Is screwed. As a result, when the adjustment knob 23 is turned, the adjustment knob 23 is screwed back and forth to move the lever 12 in a direction perpendicular to the swing shaft 11. A leaf spring 24 fixed to the base block is pressed against the adjustment knob 23 to hold the adjustment position of the adjustment knob 23.

The stop finger 6 allows the sheet 3 to pass toward the paper feed cylinder 2 when it swings downward, and abuts against the front edge of the sheet 3 when it swings upward, so that the sheet 3 is stopped. The sheet 3 is prevented from passing toward the paper feed cylinder 2.

That is, the stop finger 6 is a substantially U-shaped member, is fixed at a predetermined interval to the horizontal swing shaft 15 supported by the left and right printing press frames 8a and 8b, and is fixed to the shaft 5a of the lower feed roller 5. It bypasses the lower side and projects above the lower feed roller 5. The protruding portion penetrates upwardly through the hole 7b at the front end of the comb teeth of the lower paper guide 7.

Swing shaft 15 for supporting stop finger 6
Is urged in the clockwise direction in FIG. 3 by a torsion coil spring 25 hung between it and the printing machine frame 8b, so that the tips of the stop fingers 6 project above the lower feed roller 5 and the sheet 3 advances. It is possible to prevent

The swing shaft 15 can be angularly moved downward against the biasing force of the torsion coil spring 25 by a second cam mechanism which is interlocked with the paper feed cylinder 2. That is, a lever 17 is attached to the swing shaft 11 of the upper feed roller 4, and the cam 1 is pushed from above by the lever 17.
6 is fixed on the swing shaft 15 of the stop finger 6. As a result, when the upper feed roller 4 swings downward, the stop finger 6 also rotates downward.

The lever 17 is loosely fitted on the swing shaft 11, and the block 26 is fixed on the swing shaft 11 so as to be adjacent to the lever 17. An adjusting screw 27, the tip of which abuts against the lever 17, is screwed into the block 26, and the angle of the lever 17 can be changed by moving the adjusting screw 27 back and forth. This lever 17 is used for the printing machine frame 8b.
3 is urged in the clockwise direction in FIG. 3 by a spring 28 passed between and and is pressed against the adjusting screw 27 of the block 26.

Further, the swinging shaft 15 of the stop finger 6 is designed so that its upward angular movement is restricted by a third cam mechanism which is interlocked with the paper feed cylinder 2. That is,
As shown in FIGS. 2, 5 and 6, a gear 29 is fixed at a position where the shaft 2a of the sheet feeding cylinder 2 penetrates the printing machine frame 8b on the opposite side to the outside, and the printing machine frame 8b is fixed to the gear 29. A gear 30 axially supported above meshes with a cam 31 fixed to the gear 30. The two links 32 and 33 combined in a substantially V shape are pivotally supported by the pin 34 on the printing press frame 8b, and one of the links 32 is
Is in contact with the cam 31 via the cam follower 32a. On the other hand, a lever 35 is provided at a position where the swing shaft 15 of the stop finger 6 penetrates the printing machine frame 8b to the outside.
Is fixed, and the other V-shaped link 33 is in contact with the pin 35a on the lever 35. The cam 31 has a contour curve that restricts the upward rotation of the stop finger 6 while the sheet 3 is passing over the stop finger 6 and rotates upward after the passage.

One of the V-shaped links 32 is a link.
Is pressed against the cam 31 by being pulled by the spring 36 on the printer frame 8b, and the link 35 is pulled by the lever 35 being pulled by the spring 37 on the printer frame 8b.
It is pressed to 2.

However, the swing shaft 15 of the stop finger 6 moves to the third position as the upper feed roller 4 rises.
By the transmission from the cam mechanism of the above, the jaws 1 of the paper feed cylinder 2 are gripped.
After passing through the stop finger 6, the sheet 3 held by 4 makes an angular motion upward, and the tip end of the stop finger 6 swings and protrudes above the lower feed roller 5.

In the paper feeding device, the first, second and third cam mechanisms and the paper feed cylinder are used when an illegal paper feed occurs such that the front edge of the sheet 3 is inclined with respect to the traveling direction. There is provided an engagement / disengagement mechanism for releasing the interlocking with the second and maintaining the upward swinging state of the stop finger 6 and the upper feed roller 4. As shown in FIGS. 2 and 5, the engagement / disengagement mechanism includes a first engagement / disengagement mechanism for releasing the interlocking between the first and second cam mechanisms and the sheet feeding cylinder 2, and a third cam mechanism and the sheet feeding mechanism. Torso 2
It is divided into a second engagement / disengagement mechanism that releases the linkage with.

The first engagement / disengagement mechanism includes a first latch piece 38 fixed to a position where the swing shaft 11 of the upper feed roller 4 penetrates the printing machine frame 8b to the outside, and a first latch piece 38. Pin 3 is attached to the removable press frame 8b.
It is provided with a second latch piece 39 pivotally supported via 9a, and a solenoid 40 for rotating the second latch piece 39 to engage and disengage the first latch piece 38. The solenoid 40 is fixed to the printing press frame 8b, and its operating piece is connected to the second latch piece 39 via a link 41. The second latch piece 39 is biased in the clockwise direction around the pin 39a in FIG. 5 by the spring 46 hung between the second latch piece 39 and the printing machine frame 8b.
Is separated from the latch piece 38.

The second engagement / disengagement mechanism comprises a solenoid 42 fixed to the printing press frame 8b, and a link 43 connecting an operating piece of the solenoid 42 to one of the V-shaped links 33. . The solenoid 42 is off
In the state, the link 43 projects outward from the solenoid 42 and one of the V-shaped links 33 is connected to the lever 3
The pin 35a of No. 5 is separated. The spring 44 is for pulling the link 33 toward the base of the link 43.

However, when the occurrence of illegal paper is detected by a sensor (not shown), both solenoids 40 and 42 are turned on, and the links 41 and 43 are pulled respectively. When the link 41 is pulled, the second latch 39 rotates counterclockwise around the pin 39a in FIG. 5 to stop at the position indicated by the solid line, and engages with the first latch 38 on the swing shaft 11 side. . As a result, the transmission between the cam 13 and the lever 12 is released, the swing shaft 11 remains rotated upward, and the upper feed roller 4 is kept away from the lower feed roller 5. When the link 43 is pulled,
The link 33 hits the pin 35a of the lever 35 to separate the pin 35a from the link 32, and the lever 35 is rotated counterclockwise around the swing shaft 15 in FIG. Therefore, the stop finger 6 fixed to the swing shaft 15
The transmission from the third cam mechanism is interrupted and the upper cam remains rotated upward, and at the same time as the occurrence of illegal paper, the stop finger 6 blocks the leading sheet 3 from going and enters the sheet feeding cylinder 2. Will be blocked.

Thereafter, the illegal paper is removed and the solenoid 4
When 0 is demagnetized, the link 41 projects, the second latch piece 39 separates from the first latch piece 38, and the upper feed roller 4 is released. Further, when the solenoid 42 is demagnetized, the link 43 is projected and the link 33 is moved to the lever 35.
The pin 35a is released to release the restraint of the swing shaft 15 and the stop finger 6. As a result, the upper feed roller 4 and the stop finger 6 can again swing up and down.

In the above embodiment, the first and second engagement / disengagement mechanisms are operated by separate solenoids 40 and 42, but a single solenoid may be operated simultaneously. .

Next, a series of movements of the paper feeding device will be described. The sheet 3 sent from a sheet feeding unit (not shown) is stopped by the leading edge of the sheet 3 being caught by the stop finger 6 which has been swung upward, and waits for the gripper 14 of the sheet feeding cylinder 2 to arrive.

When the gripping claw 14 arrives, the first cam mechanism causes the upper feed roller 4 to swing downward, and
The cam mechanism causes the stop finger 6 to swing downward. As a result, the stop finger 6 releases the interruption of the sheet 3, and the upper feed roller 4 sandwiches the sheet 3 together with the lower feed roller 5 and promptly feeds it toward the gripper claw 14. The gripping claw 14 of the paper feed cylinder 2 receives the sheet 3 and clamps its front edge.

When the sheet 3 reaches the gripper claw 14, the first
The upper feed roller 4 swings upward by the cam mechanism of (1) and separates from the lower feed roller 5 to release the sheet 3. The sheet 3 is pulled out of the paper feeding device as the sheet feeding cylinder 2 rotates, and then is fed between the impression cylinder, which is the sheet feeding cylinder 2, and a blanket cylinder that is in contact with the sheet feeding cylinder 2 for printing. .

On the other hand, the stop finger 6 is regulated by the third cam mechanism, and the sheet 3 held by the gripping claw 14 of the paper feed cylinder 2 passes above the stop finger 6 and then rocks upward. The leading end 6a is caused to project above the lower feed roller 5. Therefore, the sheet 3 is sent to the paper feed cylinder 2 without being scratched by the stop finger 6. The projecting stop finger 6 hits the front edge of the succeeding sheet 3 to prevent its advance, and keeps its posture until the gripping claw 14 arrives again.

If illegal feeding, delayed paper, or the like occurs during feeding by the above-mentioned paper feeding device, the engagement / disengagement mechanism is actuated, and the first, second, and third cam mechanisms act as stop fingers 6. The transmission to the upper feed roller 4 is cut off. As a result, the stop finger 6 and the upper feed roller 4 remain swinging upward, and the sheet 3
Is blocked by the stop finger 6 and the supply of the sheet 3 to the sheet feeding cylinder 2 is stopped. When the illegal feeding is removed, the engagement / disengagement mechanism is returned to the original state, and the feeding can be performed again.

[0043]

According to the present invention, the upward swinging of the stop finger is regulated by the third cam mechanism, and the sheet held by the gripping claw of the sheet feeding cylinder has passed over the stop finger. Since it can be swung upwards later, scratching of the sheet surface of the sheet by the stop fingers can be prevented and printing quality can be improved.

Further, in the case where the engaging / disengaging mechanism is provided in the present invention, the operation of the engaging / disengaging mechanism causes the first, second, and third cam mechanisms to move the stop finger and the upper feed roller when an illegal sheet is fed. Can be stopped and the stop finger and the upper feed roller can be kept rotating upward, so that the supply of the sheet to the paper feed cylinder can be stopped.

[Brief description of the drawings]

FIG. 1 is a developed sectional view showing a left half of a paper feeding device of a sheet-fed printing press according to the present invention.

FIG. 2 is a developed sectional view showing a right half of the paper feeding device.

FIG. 3 is a partially cutaway side view of the paper feeding device as seen from the operating side.

FIG. 4 is a side view of the paper feeding device as viewed from the outside of the operating-side printing press frame.

FIG. 5 is a partially cutaway side view of the paper feeding device as seen from the outside of the printing press frame on the non-operating side.

FIG. 6 is a half sectional view of a sheet feeding cylinder.

FIG. 7 is a partially cutaway side view of a conventional paper feeding device immediately before paper feeding as viewed from the operating side.

FIG. 8 is a partially cutaway side view of a conventional paper feeding device during feeding, as viewed from the operating side.

FIG. 9 is a partially cutaway side view of a conventional paper feeding device immediately after paper feeding, viewed from the operating side.

[Explanation of symbols]

 2 ... Paper feed cylinder 3 ... Sheets 4 ... Upper feed roller 5 ... Lower feed roller 6 ... Stop finger 14 ... Holding jaw 13 ... First cam mechanism cam 16 ... Second cam mechanism cam 31 ... 3 cam mechanism cam

Claims (2)

[Claims] 1. A stop finger for allowing the passage of a sheet toward the feed cylinder when it swings downward, and a passage for stopping the sheet when it swings upward, and a lower which can contact the lower surface of the sheet. A feed roller, an upper feed roller that separates the sheet from the lower feed roller when it swings upward and swings it downward, and feeds the sheet together with the lower feed roller toward the paper feed cylinder; A first cam mechanism interlocked with the paper feed cylinder that swings the upper feed roller downward and then swings upward when the front edge of the paper faces the jaws of the paper feed cylinder; and the upper. A second cam mechanism interlocking with the paper feed cylinder that swings the stop finger downward when the feed roller swings downward, and the sheet held by the gripper jaws of the paper feed cylinder. Is above the stop finger A sheet feeding device for a sheet-fed printing press, comprising: a third cam mechanism interlocked with the sheet feeding cylinder, which swings the stop finger above the lower feed roller after passing through the sheet feeding roller. 2. An engagement / disengagement for stopping the transmission from the first, second and third cam mechanisms to maintain the state in which the stop finger and the upper feed roller are rotated upward when an illegal sheet is fed. The sheet feeding device of the sheet-fed printing press according to claim 1, wherein a mechanism is provided.